Need help with both shown questions! Tysm!!

Arestaurant offers delivery for their pizzas. the total cost the customer pays is the price of the pizzas, plus a delivery fee. one customer pays $23 to have 2 pizzas delivered. another customer pays $59 for 6 pizzas. how many pizzas are delivered to a customer who pays $86?

5cakes cost 3.50 how much do 7 cakes cost

Why does the shape of the distribution of the weights of russet potatoes tend to be symmetrical?